CN204717721U - A kind of liquid ammonia process for caustic soda purification SNCR denitration device being applicable to CFBB - Google Patents
A kind of liquid ammonia process for caustic soda purification SNCR denitration device being applicable to CFBB Download PDFInfo
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- CN204717721U CN204717721U CN201520205769.7U CN201520205769U CN204717721U CN 204717721 U CN204717721 U CN 204717721U CN 201520205769 U CN201520205769 U CN 201520205769U CN 204717721 U CN204717721 U CN 204717721U
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Abstract
A kind of liquid ammonia process for caustic soda purification SNCR denitration device being applicable to CFBB, comprise: for providing the liquefied ammonia induction system of denitrification reducing agent, connect the gas ammonia preparation system of liquefied ammonia induction system outlet for the preparation of gas ammonia, connecing the dilution system of gas ammonia preparation system outlet for being diluted by gas ammonia, connecing the spraying system that diluted gas ammonia is sent into flue by dilution system outlet; The utility model is by directly utilizing gas ammonia to reach the object removing nitrogen oxides in effluent, there is system stability, the feature that efficient, operating cost is low, control is simple, automaticity is high, the removal of nitrogen oxide in the industry such as electric power, derived energy chemical CFBB flue gas can be widely used in.
Description
Technical field
The utility model belongs to gas denitrifying technology field, is specifically related to a kind of liquid ammonia process for caustic soda purification SNCR denitration device being applicable to CFBB.
Background technology
At present, country's proposition will control NO in " 12 " period
xdischarge.According to fossil-fuel power plant atmospheric pollutant emission standard (GB 13223-2011) requirement, newly-built fired power generating unit plays NO on January 1st, 2012
xdischarge is lower than 100mg/m
3(6%O
2); Active service W flame stove, recirculating fluidized bed (CFB) unit NO
xdischarge is lower than 200mg/m
3(6%O
2), key area also performs new-built unit requirement.Therefore, a large amount of denitration technologies arises at the historic moment.
SNCR method (SNCR) is a kind of flue-gas denitration process of comparative maturity.At present, environmental protection company all uses urea or ammoniacal liquor directly to spray in the flue gas of 850 DEG C ~ 1150 DEG C, with NO in flue gas as reducing agent
xthere is reduction reaction, reach and reduce NO
xthe object of discharge.Urea method denitrating technique needs the manpower of at substantial to prepare urea liquid, and requires that higher, easy crystallization, control are comparatively complicated to the material of equipment; Ammonia Process denitrating technique is generally by the ammoniacal liquor of buying about 20%, and in ammoniacal liquor, the water of 80% does not participate in reduction reaction.Therefore, in transportation, waste a large amount of resources to transport useless water, waste very serious.The utility model, based on the general principle of ammonia and reaction of nitrogen oxides, develops a kind of denitrification apparatus directly utilizing ammonia, have system operation cost low, control the advantage simple, denitration efficiency is high.
Summary of the invention
In order to overcome the shortcoming of urea method/Ammonia Process denitration technology, the purpose of this utility model is to provide a kind of liquid ammonia process for caustic soda purification SNCR denitration device being applicable to CFBB, and the utility model is by directly utilizing gas ammonia to reach the object removing nitrogen oxides in effluent; There is system stability, the feature that efficient, operating cost is low, control is simple, automaticity is high, the removal of nitrogen oxide in the industry such as electric power, derived energy chemical CFBB flue gas can be widely used in.
To achieve these goals, the technical scheme that the utility model is taked is:
Be applicable to a liquid ammonia process for caustic soda purification SNCR denitration device for CFBB, comprise:
For providing the liquefied ammonia induction system 1 of denitrification reducing agent,
Connect liquefied ammonia induction system 1 and export gas ammonia preparation system 2 for the preparation of gas ammonia,
Connect gas ammonia preparation system 2 and export dilution system 3 for being diluted by gas ammonia,
Connect dilution system 3 and export the spraying system 4 diluted gas ammonia being sent into flue;
Described liquefied ammonia induction system 1 comprises liquid ammonia storage tank 5, is arranged on liquefied ammonia delivery pump 6 on liquid ammonia storage tank 5 liquefied ammonia outlet conduit, is connected with liquefied ammonia delivery pump bypass valve 7 between the two ends of liquefied ammonia delivery pump 6;
Described gas ammonia preparation system 2 comprises the liquid ammonia evaporator 11 be connected with the liquefied ammonia delivery pump 6 of liquefied ammonia induction system 1, be connected to the steam pipeline 9 of liquid ammonia evaporator 11 steam inlet end, steam pipeline 9 is provided with steam stop valve 10, be connected to the Automatic steam trap Trap 13 of liquid ammonia evaporator 11 liquid phase end, be connected to the gas ammonia surge tank 15 of liquid ammonia evaporator 11 gas phase end, the pipeline that gas ammonia surge tank 15 is connected with liquid ammonia evaporator 11 is provided with gas ammonia pressure-control valve 14, liquid ammonia evaporator 11 is also provided with safety valve 12, the pipeline that liquid ammonia evaporator 11 is connected with liquefied ammonia delivery pump 6 is provided with liquefied ammonia stop valve 8,
Described dilution system 3 comprises and exports with gas ammonia surge tank 15 ammonia/the air mixer 18 be connected, be connected to the dilution air 16 of the air end of ammonia/air mixer 18, the pipeline that dilution air 16 is connected with ammonia/air mixer 18 be provided with and dilute wind control valve 17;
Described spraying system 4 comprises multiple gas ammonia control valve 19 of ammonia/air mixer 18 port of export being connected in dilution system 3 in parallel and the gas ammonia spray gun 20 be installed in CFBB of each gas ammonia control valve 19 connection.
Described liquefied ammonia delivery pump bypass valve 7 uses when liquid ammonia storage tank pressure is enough high, and now liquefied ammonia delivery pump 6 cuts out.
Further, described gas ammonia spray gun 20 comprises the metal hose 25 be connected with gas ammonia control valve 19, the gun body 27 be connected with metal hose 25, is arranged on the protective casing 26 and gas ammonia shower nozzle 28 of gun body 27 being protected spray gun.
Further, described gas ammonia spray gun 20 is installed on boiler hearth of circulating fluidized bed 22, horizontal flue 23 or central tube 24.
Further, described gas ammonia control valve 19 signal received from flue gas analyzer can automatically adjust gas ammonia size.
Further, described gas ammonia pressure-control valve 14 can regulate gas ammonia pressure size automatically according to setting pressure.
Compared to the prior art, tool has the following advantages the utility model:
1) the utility model systematization, automaticity are high, and all operations only need operate in control room.Gas ammonia control valve 19 signal received from flue gas analyzer carries out the automatic adjustment of gas ammonia through the calculating of control system, automatically stop after nitrogen oxide reaches desired value.
2) proprietary gas ammonia spray gun 20 designs, and ensure that the stability of spray gun work, reliability, high efficiency.Compared with existing urea spray gun, ammonia water spray gun, do not need to carry out water-cooled or Air flow to spray gun separately, saved the energy.
3) burner hearth 22, horizontal flue 23, the choosing of central tube 24 spray site position, the transformation making SNCR denitration technology be applied to existing CFBB (CFB) is provided with higher operability, change little, small investment, denitration efficiency are high.Spray gun is arranged vertically on horizontal flue, and this place's flue sectional area is little, flow velocity is high, be convenient to mixing; Flue gas enters cyclone separator, turbulence herein after spray gun layout points at once, and exacerbate the mixing velocity of reductant solution and flue gas, reduction reaction is occurred faster, denitration efficiency can reach more than 60%.
Accompanying drawing explanation
Fig. 1 is system flow chart of the present utility model.
Fig. 2 is spray gun structure schematic diagram of the present utility model.
Detailed description of the invention
Below in conjunction with drawings and the specific embodiments, the utility model is described in further detail.
As shown in Figure 1, a kind of liquid ammonia process for caustic soda purification SNCR denitration device being applicable to CFBB of the utility model, comprise: for providing the liquefied ammonia induction system 1 of denitrification reducing agent, connect liquefied ammonia induction system 1 and export gas ammonia preparation system 2 for the preparation of gas ammonia, connect gas ammonia preparation system 2 and export dilution system 3 for being diluted by gas ammonia, connect dilution system 3 and export the spraying system 4 diluted gas ammonia being sent into flue.
Described liquefied ammonia induction system 1 comprises liquid ammonia storage tank 5, is arranged on liquefied ammonia delivery pump 6 on liquid ammonia storage tank 5 liquefied ammonia outlet conduit, is connected with liquefied ammonia delivery pump bypass valve 7 between the two ends of liquefied ammonia delivery pump 6; Liquefied ammonia delivery pump 6 generally in winter or when the liquefied ammonia in liquid ammonia storage tank is insufficient, uses when pressure is lower; Generally, close liquefied ammonia delivery pump 6, opening liquefied ammonia delivery pump bypass valve 7 can meet user demand.
Described gas ammonia preparation system 2 comprises the liquid ammonia evaporator 11 be connected with the liquefied ammonia delivery pump 6 of liquefied ammonia induction system 1, be connected to the steam pipeline 9 of liquid ammonia evaporator 11 steam inlet end, steam pipeline 9 is provided with steam stop valve 10, be connected to the Automatic steam trap Trap 13 of liquid ammonia evaporator 11 liquid phase end, be connected to the gas ammonia surge tank 15 of liquid ammonia evaporator 11 gas phase end, the pipeline that gas ammonia surge tank 15 is connected with liquid ammonia evaporator 11 is provided with gas ammonia pressure-control valve 14, liquid ammonia evaporator 11 is also provided with safety valve 12, the pipeline that liquid ammonia evaporator 11 is connected with liquefied ammonia delivery pump 6 is provided with liquefied ammonia stop valve 8, steam pipeline 9 provides the steam required for evaporation liquefied ammonia to liquid ammonia evaporator 11, maintains uniform temperature, discharges after temperature reduces from Automatic steam trap Trap 13.Gas ammonia pressure-control valve 14 regulates automatically according to after setting user subsequent technique setting pressure, the gas ammonia pressure in gas ammonia surge tank 15 is maintained within the scope of certain pressure and fluctuates.The gas ammonia of going out from gas ammonia surge tank 15 enters gas ammonia dilution system 3.
Described dilution system 3 comprises and exports with gas ammonia surge tank 15 ammonia/the air mixer 18 be connected, be connected to the dilution air 16 of the air end of ammonia/air mixer 18, the pipeline that dilution air 16 is connected with ammonia/air mixer 18 be provided with and dilute wind control valve 17; Dilution wind control valve 17 carries out both air flow modulation according to setting dilution ratio and mixes in ammonia/air mixer 18 with gas ammonia, for gas ammonia spray gun 20.
Described spraying system 4 receives the gas ammonia from gas ammonia dilution system, comprises multiple gas ammonia control valve 19 of ammonia/air mixer 18 port of export being connected in dilution system 3 in parallel and the gas ammonia spray gun 20 be installed in CFBB of each gas ammonia control valve 19 connection.Gas ammonia control valve 19 signal received from flue gas analyzer carries out the automatic adjustment of gas ammonia flow.Gas ammonia spray gun 20 is installed on the correct positions such as boiler hearth of circulating fluidized bed, horizontal flue, central tube, is sprayed into uniformly in flue gas by gas ammonia, with the reaction of nitrogen oxides in flue gas, reaches the object removing nitrogen oxide.
As shown in Figure 2; as preferred embodiment of the present utility model; described gas ammonia spray gun 20 comprises the metal hose 25 be connected with gas ammonia control valve 19, the gun body 27 be connected with metal hose 25, is arranged on the protective casing 26 and gas ammonia shower nozzle 28 of gun body 27 being protected spray gun.
The foregoing is only an instantiation of the present utility model, and unrestricted the utility model, the utility model can have various modifications and variations.Within all spirit in the utility model information and principle, any amendment, improvement etc. done, all should be included within protection domain of the present utility model.
Claims (5)
1. be applicable to a liquid ammonia process for caustic soda purification SNCR denitration device for CFBB, it is characterized in that: comprising:
For providing the liquefied ammonia induction system (1) of denitrification reducing agent,
Connect the gas ammonia preparation system (2) of liquefied ammonia induction system (1) outlet for the preparation of gas ammonia,
Connect the dilution system (3) that gas ammonia preparation system (2) outlet is used for gas ammonia to dilute,
Connect the spraying system (4) that diluted gas ammonia is sent into flue by dilution system (3) outlet;
Described liquefied ammonia induction system (1) comprises liquid ammonia storage tank (5), be arranged on liquefied ammonia delivery pump (6) on liquid ammonia storage tank (5) liquefied ammonia outlet conduit, between the two ends of liquefied ammonia delivery pump (6), be connected with liquefied ammonia delivery pump bypass valve (7);
Described gas ammonia preparation system (2) comprises the liquid ammonia evaporator (11) be connected with the liquefied ammonia delivery pump (6) of liquefied ammonia induction system (1), be connected to the steam pipeline (9) of liquid ammonia evaporator (11) steam inlet end, steam pipeline (9) is provided with steam stop valve (10), be connected to the Automatic steam trap Trap (13) of liquid ammonia evaporator (11) liquid phase end, be connected to the gas ammonia surge tank (15) of liquid ammonia evaporator (11) gas phase end, the pipeline that gas ammonia surge tank (15) is connected with liquid ammonia evaporator (11) is provided with gas ammonia pressure-control valve (14), liquid ammonia evaporator (11) is also provided with safety valve (12), the pipeline that liquid ammonia evaporator (11) is connected with liquefied ammonia delivery pump (6) is provided with liquefied ammonia stop valve (8),
Described dilution system (3) comprises the ammonia/air mixer (18) exporting with gas ammonia surge tank (15) and be connected, be connected to the dilution air (16) of the air end of ammonia/air mixer (18), the pipeline that dilution air (16) is connected with ammonia/air mixer (18) be provided with and dilute wind control valve (17);
Described spraying system (4) comprises the gas ammonia spray gun (20) be installed in CFBB that multiple gas ammonia control valve (19) of ammonia/air mixer (18) port of export being connected in dilution system (3) in parallel and each gas ammonia control valve (19) connect.
2. a kind of liquid ammonia process for caustic soda purification SNCR denitration device being applicable to CFBB according to claim 1; it is characterized in that: described gas ammonia spray gun (20) comprises the metal hose (25) be connected with gas ammonia control valve (19); the gun body (27) be connected with metal hose (25), is arranged on protective casing (26) and the gas ammonia shower nozzle (28) of gun body (27) upper protection spray gun.
3. a kind of liquid ammonia process for caustic soda purification SNCR denitration device being applicable to CFBB according to claim 1, is characterized in that: described gas ammonia spray gun (20) is installed on boiler hearth of circulating fluidized bed (22), horizontal flue (23) or central tube (24).
4. a kind of liquid ammonia process for caustic soda purification SNCR denitration device being applicable to CFBB according to claim 1, is characterized in that: described gas ammonia control valve (19) signal received from flue gas analyzer can automatically adjust gas ammonia size.
5. a kind of liquid ammonia process for caustic soda purification SNCR denitration device being applicable to CFBB according to claim 1, is characterized in that: described gas ammonia pressure-control valve (14) can regulate gas ammonia pressure size automatically according to setting pressure.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520205769.7U CN204717721U (en) | 2015-04-07 | 2015-04-07 | A kind of liquid ammonia process for caustic soda purification SNCR denitration device being applicable to CFBB |
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|---|---|---|---|
| CN201520205769.7U CN204717721U (en) | 2015-04-07 | 2015-04-07 | A kind of liquid ammonia process for caustic soda purification SNCR denitration device being applicable to CFBB |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764035A (en) * | 2015-04-07 | 2015-07-08 | 中国华能集团清洁能源技术研究院有限公司 | Liquid ammonia method SNCR (selective non-catalytic reduction) nitrate removal system suitable for circulating fluidized bed boiler |
| CN106401716A (en) * | 2016-11-09 | 2017-02-15 | 郑丹 | Tail gas denitration device of natural gas internal combustion engine generator |
| CN107339691A (en) * | 2017-06-20 | 2017-11-10 | 神华集团有限责任公司 | A kind of combustion system of circulating fluidized bed boiler and burning process |
-
2015
- 2015-04-07 CN CN201520205769.7U patent/CN204717721U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764035A (en) * | 2015-04-07 | 2015-07-08 | 中国华能集团清洁能源技术研究院有限公司 | Liquid ammonia method SNCR (selective non-catalytic reduction) nitrate removal system suitable for circulating fluidized bed boiler |
| CN106401716A (en) * | 2016-11-09 | 2017-02-15 | 郑丹 | Tail gas denitration device of natural gas internal combustion engine generator |
| CN107339691A (en) * | 2017-06-20 | 2017-11-10 | 神华集团有限责任公司 | A kind of combustion system of circulating fluidized bed boiler and burning process |
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